Heading track deviation in a non adherence to an ATC clearance instruction.

Attributes
ACN	200658
Time
Date	199201
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cak airport : oak
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : oak
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 2300 flight time type : 35
ASRS Report	200658
Person 2
Affiliation	government : faa
Function	flight crew : first officer observation : company check pilot oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

On a chkride, we just completed one approach to a full stop (nob 27R) at oak. We requested IFR departure radar vectors for ILS 27R. The controller told us to taxi back to 27R for takeoff then changed to hold position expect 09L. He then came back with 09L departure but with different departure clearance. A different controller came on and cleared us for immediate takeoff runway 09L, an aircraft was on 1-2 mi final for 27R. The controller then cleared the aircraft on final to land 27R and advised him departing aircraft would be turning sebound. The controller then told us to start turn immediately. I turned right to be southeast heading. Well, apparently our amended clearance back on the ground was for a left turn to 080 degrees on departure. I never heard that. In fact, I may be in error about the 'southeast turn' referring to us. Possible causes: being on a chkride with FAA (part 135 chkride). Being in a new airplane. Being issued 2-3 different sets of departure instructions then while trying to sort that out being given an immediate departure. In retrospect: I should have declined the takeoff clearance. Note: there never was a conflict with any other aircraft.

Original NASA ASRS Text

Title: HDG TRACK DEV IN A NON ADHERENCE TO AN ATC CLRNC INSTRUCTION.

Narrative: ON A CHKRIDE, WE JUST COMPLETED ONE APCH TO A FULL STOP (NOB 27R) AT OAK. WE REQUESTED IFR DEP RADAR VECTORS FOR ILS 27R. THE CTLR TOLD US TO TAXI BACK TO 27R FOR TKOF THEN CHANGED TO HOLD POS EXPECT 09L. HE THEN CAME BACK WITH 09L DEP BUT WITH DIFFERENT DEP CLRNC. A DIFFERENT CTLR CAME ON AND CLRED US FOR IMMEDIATE TKOF RWY 09L, AN ACFT WAS ON 1-2 MI FINAL FOR 27R. THE CTLR THEN CLRED THE ACFT ON FINAL TO LAND 27R AND ADVISED HIM DEPARTING ACFT WOULD BE TURNING SEBOUND. THE CTLR THEN TOLD US TO START TURN IMMEDIATELY. I TURNED R TO BE SE HDG. WELL, APPARENTLY OUR AMENDED CLRNC BACK ON THE GND WAS FOR A L TURN TO 080 DEGS ON DEP. I NEVER HEARD THAT. IN FACT, I MAY BE IN ERROR ABOUT THE 'SE TURN' REFERRING TO US. POSSIBLE CAUSES: BEING ON A CHKRIDE WITH FAA (PART 135 CHKRIDE). BEING IN A NEW AIRPLANE. BEING ISSUED 2-3 DIFFERENT SETS OF DEP INSTRUCTIONS THEN WHILE TRYING TO SORT THAT OUT BEING GIVEN AN IMMEDIATE DEP. IN RETROSPECT: I SHOULD HAVE DECLINED THE TKOF CLRNC. NOTE: THERE NEVER WAS A CONFLICT WITH ANY OTHER ACFT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.